Volatile matter (at 135 °C), not more than 15 percent.
Water-insoluble matter, not more than 0.2 percent.
Chlorides and sulfates (calculated as sodium salt), not more than 20 percent.
The trisodium salt of 1,3,6-pyrenetrisulfonic acid, not more than 6 percent.
The tetrasodium salt of 1,3,6,8-pyrenetetrasulfonic acid, not more than 1 percent.
Pyrene, not more than 0.2 percent.
Lead (as Pb), not more than 20 parts per million.
Arsenic (as As), not more than 3 parts per million.
Mercury (as Hg), not more than 1 part per million.
Total color, not less than 65 percent.
21 C.F.R. §74.1208